My machine shows "assembling windows updates" on every reboot and then performs one additional forced reboot every time I restart it. This seems to be related to KB4093112 or KB4074588, which show as status "Requires a restart to finish installing" in update history. They both mention "Even though the update was successfully installed, Windows Update incorrectly reports that the update failed to install" as an issue in the patch notes. However, they don't state whether that will produce the symptoms I am seeing or how to fix it. Anyone else seeing the same behaviour, or is there another reason why this is happening?